1221222201201 has 12 divisors (see below), whose sum is σ = 1805010592528. Its totient is φ = 795214456344.

The previous prime is 1221222201191. The next prime is 1221222201217. The reversal of 1221222201201 is 1021022221221.

It is a happy number.

1221222201201 is a `hidden beast` number, since 1 + 221 + 22 + 220 + 1 + 201 = 666.

It is not a de Polignac number, because 1221222201201 - 2⁶ = 1221222201137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1221222208201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1577806075 + ... + 1577806848.

Almost surely, 2^{1221222201201} is an apocalyptic number.

It is an amenable number.

1221222201201 is a deficient number, since it is larger than the sum of its proper divisors (583788391327).

1221222201201 is a wasteful number, since it uses less digits than its factorization.

1221222201201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3155612972 (or 3155612969 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1221222201201 its reverse (1021022221221), we get a palindrome (2242244422422).

The spelling of 1221222201201 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred one thousand, two hundred one".